Rocky Graziano’s widow wants to KO her “little creep” of a grandson for planning to auction the former world middleweight boxing champ’s title belt, which she says belongs to her.

“My grandson does not own that belt to sell, so we’ve got to stop him,” 83-year-old Norma Graziano, of Manhattan, fumed yesterday.

Asked how Rocky would have dealt with their grandson, Aaron Graziano, Norma replied: “Probably kill him.”

Rocky’s relatives learned from a Post story Monday that the champ’s belt – won in an epic July1947 knockout of Tony Zale in Chicago – is scheduled to be auctioned Nov. 15 in Louisville, Ky. The belt is expected to fetch up to $75,000. It had been consigned to Hunt Auctions by Aaron Graziano, 33, a Chicago resident.

Norma said that for years, she had allowed her daughter, Audrey – Aaron’s mother – to keep the as a memento of Rocky, a Lower East Side native who died in 1990.

Audrey died two years ago, and “that’s how this little creep got a hold of it,” said Norma of Aaron.

“He was supposed to return it. I kept believing him when he told me he was going to give it back.”

Last Thanksgiving, “he came to be with the family. I was in the hospital, and he promised that he was going to bring the belt. And he lied,” said. “He didn’t show up with the belt.”